The purpose of this paper is to develop new approaches for optimizing the technological flows at coal mines. Based on analysis, the area of the presented approaches application has been outlined for decision-making in mining. The concept is to use graph theory methods and network models for balancing the flows incoming to the mine in the form of resources and the output flows in the form of coal, rock, gas, and water. This improves the overall efficiency of functioning the mining enterprise. A new model is proposed that describes the production activity of the underground mining complex for the delivery of three production components to the surface. These components from the viewpoint of rational resource and environmental management can be considered as factors that may have a negative impact on the level of technological scheme in terms of investing advisability, as well as on the environment. These components are coal, rock, methane gas and mine water. Given their stochastic nature, it is accepted for the mathematical description of the movement processes of coal (С), rock (R), methane gas (G) and water (W) to represent them in the form of flows within some technological system of converters, and including the diversification of mining production. The presented approach can be applied not only at the stage of designing, but also to assess the existing state of the coal mines. Special attention is focused on the development of software for decision-making.
Purpose. Substantiating the method for forecasting rock pressure manifestation in the system "layered massifworking support" on the basis of displacement patterns detection at any arbitrary point of the preparatory working circuit during the computational experiments. Methods.Computational experiments were carried out on the basis of the finite element method using the solid computational domain, provided superlimiting non-linear behavior of the simulated materials. The use of numerical grid methods allows creating geometrically and physically complex simulation models and manipulate their state within a wide range.Findings. The calculations defined that with weak links between adjacent strata, acting shear stresses destroy them in the vicinity of working, and the contiguous rock strata deform with mutual sliding. Analysis of reduced stress area allows to substantiate with accuracy sufficient for mining computations a unified average structure of the computational domain that most comprehensively reflects all the main features of a real mining massif which are likely to influence computational error. This choice ensures the introduced error value within 10% in the entire range of mechanical parameters change of the rock massif strata.Originality. Stress-strain state of frame support and patterns of its change with increasing mining depth are nonlinear, especially with nearby rock strata entering the superlimiting state; formation of the plastic hinges system along the frame support circuit, which causes the development of such replacements that exclude the possibility of further working exploitation.Practical implications. The proposed method allows to determine the optimal indicators of maintaining a working driven in the finely-layered rock massif, which makes it possible to significantly reduce operation costs.
Purpose. To develop a new approach to feasibility assessment mechanism of supporting production facilities of loss-making mines in Donetsk and Dnipropetrovsk regions. Methods. To solve the objective set, a complex approach was used including assessment of enterprise investment attractiveness, determination of production potential, definition of the ability to switch to a break-even mode. The process for planning ways to save the industrial potential of coal-mining regions may be considered as the reflection of multidimensional space (initial and design values) into the one-dimensional (amount of investment money). Findings. It has been established that on the stage of building a model for managing mine unprofitability decrease processes, it is necessary to overview 8-10 factorial features, which may determine the formation of economic potential, taking into consideration peculiarities of remaining deposit bedding and their quality, as integral assessment of mine potential in terms of (state and non-state) investment perception. The objective set comes down to selection of the minimum number of factors, which would the most adequately reflect the mine internal potential expressed by economic value addedas a consequence of interaction of factors of coal mine economic activities in specific mining, geological and technological conditions. Originality. The academic novelty is that as a complex component of the state of the loss-making mine, it is reasonable to use an indicator of economic reliability, which synthesizes the capacity of links, economic level of technical and economic indicators and the amount of remaining deposits. The latter determine the residual life of the mine, physical content of the proposed indicators is not identical, and it Физико-технические проблемы горного производства 2020, вып. 22 153 is this fact, which allows for their joint use to obtain a more complete estimate than when using any single indicator. Practical implications. Practical significance includes actual assessment of the state of Donbass coal enterprises and determination of marginal break-even indicators, which allowed for the formation of recommendations for attracting financial resources.
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